Tribological properties of polyimide coatings filled with graphene oxide and MXene composite nanofillers.

By combining two different types of layered nanofillers and making full use of synergistic effects, the frictional properties of the coating can be further improved. In this study, GO-MXene composites with "sandwich" structures were successfully prepared. Compared with pure PI, the tensile modulus of PI/GO-MXene composite coating is increased by 18.45 %, the tensile strength is increased by 54.49 %, the wear rate is reduced by 91.6 %, and the coefficient of friction is reduced by 34.4%. This is mainly due to the "bridging effect" of the polydopamine (PDA) to form the GO-MXene-GO "sandwich" structure, which gives full play to the synergistic lubrication between GO and MXene. [Display omitted] • The sandwich structure GO-MXene composite fillers are prepared by PDA bridging. • GO and MXene synergistically improve the frictional properties of PI composites. • Compared with pure PI, the COF of PI/GO-MXene composite is reduced by 34.4 %. • Compared to pure PI, the wear rate of PI/GO-MXene composite is reduced by 91.6 %. [ABSTRACT FROM AUTHOR]